Boron And BTCHNAB Based Laser Sensitive Energetic Material Research

Laser ignition technology has significant safety advantages such as strong anti-elec tromagnetic interference ability,and has broad application space and prospects in the fie lds of weaponry,aerospace and engineering blasting.However,the boron-potassium nitrat-e(BPN)used in the current equipment still has problems such as high ignition thres-hold and poor consistency,in view of this,BPN and 3,3’,5,5’-tetrachloro-2,2’,4,4’,6,6’-hexa nitroazobenzene(BTCHNAB)are used as laser ignition powder,different kinds of laser sensitive additives and contents are selected to study the laser ignition performance o-f the two laser ignition powders,and the main research contents and conclusions are a-s follows:(1)With refined boron powder and potassium nitrate as the main energetic materials,fluororubber,phenolic resin,toner and fluorine graphite as laser sensitive additives,the use of mechanical mixing method to modify BPN and its laser ignition performance was studied,the results show that the addition of fluororubber,phenolic resin,toner and fluorine graphite,etc.can improve the ignition threshold and ignition delay time of BPN and other laser ignition performance,when the laser-sensitive additive selects phenolic resin,the content is 4.0%,the charge density is at 1.5-1.7 g/cm~3,its laser ignition threshold is 3.5W,and the ignition delay time is 2.0 ms.(2)BTCHNAB was prepared by nitrification,rearrangement and azo reaction using dichlorobenzoic acid as raw material,and its molecular structure was characterized by infrared spectroscopy and nuclear magnetic resonance carbon spectroscopy,and its thermal properties were studied by TG-DTA;(3)With BTCHNAB as the main energetic material,fluororubber as binder,fluororubber,phenolic resin,toner and fluorine graphite as laser sensitive additives,the ignition performance of BTCHNAB laser was studied,and the results showed that under the same circumstances,the ignition threshold of carbon-black samples was the smallest,graphite was the second,carbon-containing nanotubes were the highest,and the ignition threshold of BTCHNAB was only 3.5W under the condition of adding 1%carbon black and pressing density of 1.6 g/cm~3;(4)The dopamine coating of BTCHNAB was carried out by in situ method,the structure was characterized by infrared spectroscopy,and the laser ignition and mechanical sensitivity performance tests were carried out on BTCHNAB samples with different coating times.The results show that the laser ignition threshold shows a trend of decreasing first and then stabilizing with the extension of coating time,the lowest is 3.6W at 9h,the lower the mechanical sensitivity,the lowest friction sensitivity is 28%,and the lowest impact sensitivity is 29.2cm.